In the list of loading, the Mijack also has trailer
but I don't know on which wagons these can be loaded.
In the settings of the Mijack you can set in driver mode
fold down the container mounts for trailers.
With help from norfolksouthern37 himself I managed to get MiJack to work with 100% reliability in TRS19 and TRS22. I cannot thank him enough for this amazing Trainz add-on, now working perfectly fine in all situations (as far as my testing went) in TRS19 Build: 117009 and TRS22 Build: 126273.